Loop over controls in another class - vb.net

Question

I have created one form with two datagridviews, two text boxes with some random text, and two combo boxes with some random text.
I have created two classes. DataGridViewForm and DataGridViewClass
I loop over the controls on the DataGridViewForm to clear the controls
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
' Pressing this button will clear all text and comboboxes
Dim button As New DataGridViewClass()
Dim a As Control = Nothing
For Each a In Me.Controls
button.Wissen = a
Next
End Sub
and it the DataGridViewClass
Property Wissen() As Control
Get
Return ControlName
End Get
Set(value As Control)
ControlName = value
If TypeOf ControlName Is TextBox Then
ControlName.Text = Nothing
ElseIf TypeOf ControlName Is ComboBox
ControlName.Text = String.Empty
End If
End Set
End Property
This works fine, but I would like to move the loop from the dgvFrom to the dgvClass. How would I do that? If I would move that loop I get the error "Controls is not a member of DataGridViewClass"
Okay, on the suggestion I tried this:
ControlName = value
Dim a As Control
For Each a In ControlName.Controls
If TypeOf a Is TextBox Then
a.Text = Nothing
ElseIf TypeOf a Is ComboBox
a.Text = String.Empty
End If
Next
And in DataGridViewForm I put
Dim button As New DataGridViewClass()
button.Wissen = Me
This works! Now I can use the same Clear button for other forms. Thanks!

Answer 1

The controls of DataGridViewForm are not static, you need to pass an instance of DataGridViewForm to an instance of DataGridViewClass and then DataGridViewClass will have access to all controls of DataGridViewForm, here is a basic example:
Public Class DataGridViewForm
Private DgvClassObj As DataGridViewClass
Sub New()
' pass this DataGridViewForm instance (Me) to an instance of DataGridViewClass
Init()
End Sub
Private Sub Init()
DgvClassObj = New DataGridViewClass(Me)
DgvClassObj.SomeMethodToLoopOverDataGridViewFormControls()
End Sub
End Class
Class DataGridViewClass
Private DgFormObj As DataGridViewForm
Sub New(ByRef dgform As DataGridViewForm)
Me.DgFormObj = dgform
End Sub
Public Sub SomeMethodToLoopOverDataGridViewFormControls()
For Each c As Control In DgFormObj.Controls
' now you can loop over the instance of your DataGridViewForm class
Next
End Sub
End Class